HHsearch alignment for GI: 254781179 and conserved domain: TIGR01161

>TIGR01161 purK phosphoribosylaminoimidazole carboxylase, ATPase subunit; InterPro: IPR005875 Phosphoribosylaminoimidazole carboxylase is a fusion protein in plants and fungi, but consists of two non-interacting proteins in bacteria, PurK and PurE. This family represents PurK, N5-carboxyaminoimidazole ribonucleotide (N5_CAIR) synthetase, which catalyzes the conversion of 5-aminoimidazole ribonucleotide (AIR), ATP, and bicarbonate to N5-CAIR, ADP, and Pi. PurE converts N5-CAIR to CAIR. In the presence of high concentrations of bicarbonate, PurE is reported able to convert AIR to CAIR directly and without ATP. PurK belongs to the ATP grasp superfamily of C-N ligase enzymes. Each subunit of PurK is composed of three domains (A, B, and C). The B domain contains a flexible, glycine-rich loop (B loop, T123-G130) that is disordered in the sulphate-PurK structure and becomes ordered in the MgADP-PurK structure. MgADP is wedged between the B and C domains, as with all members of the ATP grasp superfamily. Other enzymes in this superfamily contain a conserved Omega loop proposed to interact with the B loop, define the specificity of their nonnucleotide substrate, and protect the acyl phosphate intermediate formed from this substrate. PurK contains a minimal Omega loop without conserved residues. In the reaction catalyzed by PurK, carboxyphosphate is the putative acyl phosphate intermediate. The sulphate of the sulphate ion-liganded PurK interacts electrostatically with Arg 242 and the backbone amide group of Asn 245, components of the J loop of the C domain. This sulphate may reveal the location of the carboxyphosphate binding site. Conserved residues within the C-terminus of the C domain define a pocket that is proposed to bind AIR in collaboration with an N-terminal strand loop helix motif in the A domain (P loop, G8-L1). The P loop is proposed to bind the phosphate of AIR on the basis of similar binding sites observed in PurN and PurE and proposed in PurD and PurT, four other enzymes in the purine pathway .; GO: 0004638 phosphoribosylaminoimidazole carboxylase activity, 0006189 'de novo' IMP biosynthetic process, 0009320 phosphoribosylaminoimidazole carboxylase complex.
Probab=99.92  E-value=5.1e-24  Score=174.11  Aligned_cols=261  Identities=25%  Similarity=0.320  Sum_probs=187.8

Q ss_pred             CEEEECCCCHHHHHHHHHHHHHHHHHHHCCCEEEEECCCCCHHH-HHHH--C-----------------CCCEEEECCCC
Q ss_conf             28983678712788999999999999987988999615865688-8875--3-----------------99899992548
Q gi|254781179|r    1 MAVLMGGISSEREVSLSSGKACASALEDAGFKVSQIDVDRSVGL-VLAH--L-----------------KPDLAFNVLHG   60 (300)
Q Consensus         1 i~vl~GG~s~E~~iSl~S~~~i~~aL~~~g~~v~~id~~~~~~~-~l~~--~-----------------~~D~vf~~lhG   60 (300)
T Consensus         2 vGilGGGQ-------L--G~M~~~aA~~LG~~~~VL~~~~~~PA~q~Ad~~~~v~a~~~d~~~i~~La~~cDviT~E~--   70 (386)
T TIGR01161         2 VGILGGGQ-------L--GRMLALAAKKLGIKVAVLDPDANSPAKQVADSREHVLASFTDPEAIRELAEACDVITFEF--   70 (386)
T ss_pred             EEEEECCH-------H--HHHHHHHHHHCCCEEEEECCCCCCCCCCCCCCCCEEEEEECCHHHHHHHHHHCCEEEEEE--
T ss_conf             68971884-------8--999999871279589985489897311128985579985148789999997656554310--


Q ss_pred             CCCCCCHHHHH--HHHHH--HHCCCCCHHHHHHCCCCHHCCCCCCCCEEECCCEEEEC--CCC-CHH-HHHCCCCEEEEE
Q ss_conf             84343102356--66432--10023100233203650010000212100001213202--220-001-221058625643
Q gi|254781179|r   61 NFGEDGLVQAI--LELLE--IPYTHSGILASALSMDKMRSKQVVSSCGVPVCPSILVN--RFT-MDS-QHLISPPYVIKP  132 (300)
Q Consensus        61 ~~gEdg~iq~~--le~~~--ipy~Gs~~~~~~l~~dK~~~k~~l~~~gIptp~~~~~~--~~~-~~~-~~~~~~P~ivKP  132 (300)
T Consensus        71 ---Ehv~~~~L~~L~~~g~~~~-~~P~~~~l~~~~dk~~qK~~L~~~g~~vp~f~~~~~~~~~~~~~~~~~~g~p~VlK~  146 (386)
T TIGR01161        71 ---EHVDVEALEKLEARGDKVK-VRPSPEALAIIQDKLTQKQFLQKLGLPVPPFVVIEIKDEEELDSALQELGFPVVLKA  146 (386)
T ss_pred             ---CCCCCHHHHHHHHCCCEEE-EECCHHHHHHHHCHHHHHHHHHHCCCCCCCCCEEECCCHHHHHHHHHHCCCCEEEEE
T ss_conf             ---1378567899983598477-603889999883658999999966899884120223684257899987398479984


Q ss_pred             CCCC-CCCCEEEECCHHHHHHHHHHHCCCCCCCCCCCCCCCCC-CEEEEEECCCC-----CCCEEEECCCCC--CCCCCC
Q ss_conf             2477-64211432598999998863003668854223335788-45788731444-----420022025543--333110
Q gi|254781179|r  133 LKGG-SSLGIIVIKKDQSIPLDLLQSSSWNHGDQLLIEQYVDG-IELTCGVMGDA-----SLDVTEIAVPKS--DFYSYE  203 (300)
Q Consensus       133 ~~gg-sS~Gv~~v~~~~el~~~~~~~~~~~~~~~vlVEefI~G-~E~~v~Vl~~~-----~~~~~ei~~~~~--~~~dy~  203 (300)
T Consensus       147 ~~gGYDGrGq~~i~~~~~~~~~~~~~~--~~~~~~~~E~fV~F~~Elsv~vaR~~~G~~~~YP~ven-~~~ddagIl~--  221 (386)
T TIGR01161       147 RRGGYDGRGQFVIKSEADLPQALKELG--DKEEELIVEEFVPFERELSVIVARSADGEIAFYPVVEN-IHQDDAGILR--  221 (386)
T ss_pred             EECCCCCCCCEEECCHHHHHHHHHHCC--CCCEEEEEEECCCCCEEEEEEEEECCCCCEEECCCEEE-EEECCCCEEE--
T ss_conf             206527731089747432889998528--88405898523562006999999778974888286123-5652778778--


Q ss_pred             CCCCCCCCCCCCCC-CCHHHH---HHHHHHHHHHHHHHCCCCCEEEEEEEEE--CCCC----EEEEEEECCCCCCCHHHH
Q ss_conf             00011222245865-211666---5544444445775348764579999997--6898----399997472658882238
Q gi|254781179|r  204 LKYSSLNSTHVLPA-KIPLDI---YKEVQRLAFLAHQAIGCRGISRSDFLFD--PLSR----KVFWLEINVQPGMTPVSI  273 (300)
Q Consensus       204 ~Ky~~~~~~~~~Pa-~l~~~~---~~~i~~~a~~~~~alg~~g~~rvDf~~d--~~~g----~~~~lEvN~~PGlt~~s~  273 (300)
T Consensus       222 --------~~~aPAPa~p~~~~Q~~~~A~~~A~~~~~~L~~VG~~avE~F~~Pa~-dGP~P~~LLvNElAPR~HNSGHyT  292 (386)
T TIGR01161       222 --------LVVAPAPAVPDALVQQQKKAQELARRLAEELDYVGVLAVEMFLLPAK-DGPEPDELLVNELAPRPHNSGHYT  292 (386)
T ss_pred             --------EEEECCCCCCHHHHHHHHHHHHHHHHHHHHCCCEEEEEEEEEEECCC-CCCCCCCEEEEEECCCCCCCHHHH
T ss_conf             --------98633777834578999999999999998619617888999830688-789512056610257889841265


Q ss_pred             HHHHHHHCCCC-HHHHHHHHHH
Q ss_conf             99999983999-8999999999
Q gi|254781179|r  274 FPEMAAYAGYS-FRELLLWMVE  294 (300)
Q Consensus       274 ~p~~~~~~G~s-~~~li~~ii~  294 (300)
T Consensus       293 lD----gc~tSQFE~hLRAi~~  310 (386)
T TIGR01161       293 LD----GCSTSQFEQHLRAILG  310 (386)
T ss_pred             HH----HHHHHHHHHHHHHHCC
T ss_conf             66----5433179999999708